Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 stand-in used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. nevertheless had issues. encourage to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem like this car.. bought a used one.. more trouble. had the indigenous one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS dependence to be re-adjusted? The master tech did all sorts of diagnostics on all joined parts (tps, maf, iac). 0-200 every time I take on it realize the dealer for diagnostics.. on going problems are in fact totaling up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I'm 1500 too high.. or more. It's boggling to me how this hardship has morphed into various idle problems and has everyone perplexed.. or thus it seems. I've been dealing taking into account this since July.. makes me appreciate my 240z 10 epoch more.My dad owns an sc400 and its been truly fine to him.. I'm having a difficult get older not creature mordant when this purchase. I reach vibes subsequently its a fine car though. Motor sounds sweet and is super smooth taking into account meting out right.
This could be a large vacuum leak ,with the MAF connected it is abandoned measuring the ventilate that is getting gone the MAF, so if the intake manifold is sucking in ventilate the air to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into consideration carb cleaner spray can spray can in the place of the hissing afterward the engine organization and in the same way as you hear the engine stall or rev superior there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.